Collector's boosters are the best chance at scoring these rare finds, and they're sold out completely except for resellers (who are charging upwards of $1000 for just 12 Packs)
Lavinia, Azorius Renegade Lavinia, Azorius Renegade is one of those commanders that can actually be top dog at a cEDH table if everyone is playing the right kind of deck for it
Feldon also works well with cards like Kuldotha Forgemaster which can make use of your artifacts before they sacrifice at the end of the turn anyway
The card types that could appear among your nonland permanents are artifact, battle, creature, enchantment, planeswalker, and kindred
When another Black dork ETBs, you drain a life from each foe, so she's a win-con tied to a legendary dork for Command Zone purposes
However, there are plenty of other ways to cheat Equipment onto your creatures, so just getting them on the battlefield is more than enough to make Gilgamesh a star in the deck